diff --git a/sys/dev/hyperv/vmbus/vmbus.c b/sys/dev/hyperv/vmbus/vmbus.c
--- a/sys/dev/hyperv/vmbus/vmbus.c
+++ b/sys/dev/hyperv/vmbus/vmbus.c
@@ -137,6 +137,7 @@
 static int			vmbus_doattach(struct vmbus_softc *);
 static void			vmbus_event_proc_dummy(struct vmbus_softc *,
 				    int);
+static bus_dma_tag_t	vmbus_get_dma_tag(device_t parent, device_t child);
 static struct vmbus_softc	*vmbus_sc;
 
 SYSCTL_NODE(_hw, OID_AUTO, vmbus, CTLFLAG_RD | CTLFLAG_MPSAFE, NULL,
@@ -183,6 +184,7 @@
 	DEVMETHOD(bus_setup_intr,		bus_generic_setup_intr),
 	DEVMETHOD(bus_teardown_intr,		bus_generic_teardown_intr),
 	DEVMETHOD(bus_get_cpus,			bus_generic_get_cpus),
+	DEVMETHOD(bus_get_dma_tag,		vmbus_get_dma_tag),
 
 	/* pcib interface */
 	DEVMETHOD(pcib_alloc_msi,		vmbus_alloc_msi),
@@ -219,6 +221,37 @@
 	return vmbus_sc;
 }
 
+static bus_dma_tag_t
+vmbus_get_dma_tag(device_t dev, device_t child)
+{
+	struct vmbus_softc *sc = vmbus_get_softc();
+	device_t dev_res;
+	ACPI_HANDLE handle;
+	unsigned int coherent;
+
+	/* Coherency attribute */
+	dev_res =  devclass_get_device(devclass_find("vmbus_res"), 0);
+	handle = acpi_get_handle(dev_res);
+	if (ACPI_FAILURE(acpi_GetInteger(handle, "_CCA", &coherent)))
+		coherent = 0;
+	if (bootverbose)
+		device_printf(sc->vmbus_dev, "Bus is%s cache-coherent\n",
+			coherent ? "" : " not");
+
+	bus_dma_tag_create(bus_get_dma_tag(dev),	/* parent */
+		1, 0,					/* alignment, bounds */
+		BUS_SPACE_MAXADDR,			/* lowaddr */
+		BUS_SPACE_MAXADDR,			/* highaddr */
+		NULL, NULL,				/* filter, filterarg */
+		BUS_SPACE_MAXSIZE,			/* maxsize */
+		BUS_SPACE_UNRESTRICTED,			/* nsegments */
+		BUS_SPACE_MAXSIZE,			/* maxsegsize */
+		coherent ? BUS_DMA_COHERENT : 0,	/* flags */
+		NULL, NULL,				/* lockfunc, lockarg */
+		&sc->dmat);
+	return (sc->dmat);
+}
+
 void
 vmbus_msghc_reset(struct vmbus_msghc *mh, size_t dsize)
 {
diff --git a/sys/dev/hyperv/vmbus/vmbus_var.h b/sys/dev/hyperv/vmbus/vmbus_var.h
--- a/sys/dev/hyperv/vmbus/vmbus_var.h
+++ b/sys/dev/hyperv/vmbus/vmbus_var.h
@@ -129,6 +129,7 @@
 	void *icookie;
 	int vector;
 #endif
+	bus_dma_tag_t   dmat;
 };
 
 #define VMBUS_FLAG_ATTACHED	0x0001	/* vmbus was attached */